Switch with automatic shutdown (CB21258E)

This circuit was found in Maxim documentation from the 1990s. The RC circuit determines the trigger time.

Amplifier For Thermoelectric Pair (CB1432E)
We find this circuit in 1975 documentation. The circuit can be used with other operational...
AC amplifier with the LM3900 (CB14213E)
The circuit shown makes use of a symmetrical 15 V source and an LM3900 transconductance...
Binary to Hexadecimal Converter (CB17415E)
This circuit from a 2001 publication converts binary values programmed in 4 keys into hexadecimal values...